Just for fun of it.
We've pulled a 15.5' Sunline, a 16' Casita
and a 16' Scamp with a 4 cylinder Honda CRV, usually at 57 mph (tires are rated for 65mph), down Interstates at 60 mph, made loops of the USA, crossing the Rockies, driven 1000 mile dirt roads across Labrador with up to 18% grades.
With the wider, taller Sunline we averaged 20 mpg and with the two Eggs averaged 23 mpg.
The Honda has been driven 140,000 miles and towed another 30,000 miles behind our motorhome. Of the 140,000 miles 25-30,000 have been towing the 3 trailers. When not towing we average 28-30 mpg.
It's been a great tow vehicle. The Casita16 is about as heavy as we would go.
We sometimes have used an anti sway bar with the Sunline and may useone with the Scamp though we haven't seen any sway. We do not use a WD hitch.